Knock-off for terry looms



July 30, 1963 l. o. MOBERG 3,099,295

KNOCK-OFF FOR TERRY LOOMS Filed July 6, 1961 3 Sheets-Sheet l July 30, 1963 1. o. MOBERG KNOCKOFF' FOR TERRY LOOMS 3 Sheets-Sheet 2 Filed July 6. 1961 INVENTOR. IVAR O. MOSS-12G whg1eoszAlw i ATTORNEY5 July 30, 1963 l. o. MOBERG 3,099,295

KNOCK-OFF FOR TERRY LOOMS Filed July 6. 1961 5 Sheets-Sheet 3 CLUTCH and BRAKE MEANE '50 I47 1 r 1 INVENTOR: 145 44 I5\ \52 IVAR 0. 405526 ATTORNEYS United States Patent 3,099,295 KNOQK-OFF FOR TERRY LOOMS Ivar 0. Moberg, Spray, N.C., assignor to Fieldcrest Mills, Inc., Spray, N41, a corporation of Delaware Filed July 6, 1961, Ser. No. 122,145 9 Claims. ('31. 139353) This invention relates to terry looms which have a stop mot-ion for the terry and ground warps and is particularly concerned with means for controlling the stop motion to insure stoppage of the loom at a predetermined instant in any terry cycle thereof.

Generally, terry looms operate with two warp systems including ground warps and terry or pile warps. The ground warps are tight at all times to form the ground Weave, while the terry warps are periodically slackened to feed the same forwardly relative to the ground warps for the formation of terry loops. In conventional terry looms, the reed is so controlled in a three-pick terry, for example, as to have a partial or short forward stroke on each of the first and second beats or picks of the cycle, commonly known as loose picks, in order to leave two picks of weft in different sheds an appreciable distance behind the fell of the cloth. On the third beat, however, the reed has a full or long forward stroke to form a so called fast pick in which the three picks of weft are beat up against the fell of the cloth together with the then slackened terry warps, thus forming terry loops between the fell and the first of said loose picks of weft.

The terry loops are formed in a somewhat similar manner in specially constructed terry looms of the type which shift the ground warps, and cloth, including the fell, forwardly and rearwardly relative to the reed, instead of varying the strokes of the reed in forming respective loose and fast picks. Such a specially constructed type of loom is embodied in the conversion of a Warner & Swasey- Sulzer weaving machine to a terry loom which is shown and described in my copending United States patent application Serial No. 80,867, filed January 5, 1961, and entitled Terry Motion for Looms.

In either type of terry loom, it is important that both accidental and intentional loom stoppages be effected at moments in which previously formed terry loops are least likely to be pulled out of the cloth during subsequent manual handling of the warps, such as piecing up broken ends, inserting drop wires, adjusting the harnesses or heddles or performing any other corrective work which may place one or more terry warps under excessive tension. This condition exists regardless of whether loo-m stoppage is intentional or is effected by parting or undue slackness of the ground warps or terry warps, or both.

Since the loose picks of weft are inserted in different sheds and are thus relatively tightly interwoven with the warps, and both the ground warps and terry warps are under normal tension during insertion and beating up of the loose picks, it has been found that previously formed terry loops are least likely to be pulled out of the cloth if the loom is stopped, in each instance, immediately following insertion of the last, or second, loose pick of weft preceding the beating up of the same and the change of the shed for the next succeeding fast pick of weft.

When the loom is stopped in the aforesaid manner, the reed comes to rest at its back center position and the harnesses, whether up or down, still rest on the dwell portions of respective dobby cams. Although the loom drive has to be manually operated or jogged thereafter in order to bring all the harnesses to a common level such that the warps are then all in the form of a single sheet, which would be the desired position at which to stop the loom, the harnesses would then be in the course of a change in the position thereof and would thus be 3,099,295 Patented July 30, 1363 moving 'at their greatest speed if an attempt was made to stop the loom with the harnesses in level position and stopped with the harnesses and reed in the optimum position for effecting corrective work on the warps.

' Thus, after the loom is stopped with the reed in the back center position and the harnesses supported on the dwell positions of the dobby cams, it is merely necessary to manually turn the drive of the loom or jog the same through an angle of a relatively few degrees in order to bring all the harnesses or heddles to a common level while moving the reed toward, but short of engagement with, the fell :of the cloth.

It is, therefore, an object of this invention to provide an improved control means for the electric stop motion of a terry loom, which control means is effective to cause the loom to stop immediately following the insertion of a given loose pick of weft regardless of the time during a corresponding terry cycle at which the normally open primary or initiating portion of the circuit to the knockoif mechanism may be actuated and regardless of whether the initiating or primary portion of the circuit is manually actuated or it is actuated by the parting of a ground warp or a terry warp, or both.

It is another object of this invention to provide a terry loom having a warp stop motion adapted for actuation by ground warps and terry warps for operating a loom knock-off mechanism in combination with pattern controlled means for rendering said knock-off mechanism operative following insertion of a given loose pick of weft through the shed in each terry cycle (preferably the last loose pick of weft in each terry cycle), whereby with actuation of said warp stop motion, the knock-off mechanism will stop the loom only after said given loose pick has been subsequently inserted in the corresponding or immediately succeeding terry cycle.

It is another object of this invention to provide apparatus of the character last described including manually operable means for operating the loom knock-oif mechanism and arranged in series with the pattern controlled means whereby manual operation of said means for operating the loom knock-off mechanism causes subsequent stoppage of the loom only after said given loose pick of weft has been inserted.

It is a more specific object of this invention to provide a terry loom having a common electric stop motion for the ground warps and terry warps for operating a loom knock-off mechanism upon parting or undue slackening of any one or more of the ground and/ or terry warps, in combination with a pattern controlled switch interposed in an electrical circuit between the warp stop mo tion and the loom knock-off mechanism, which switch is momentarily closed only following insertion through the shed of a given loose pick of weft in each terry cycle whereby, with actuation of said warp stop motion, resulting from a parted or unduly slackened warp, the knockoff mechanism will stop the loom only after said given loose pick has been inserted in the corresponding terry cycle.

It is still another more specific object of this invention to provide, in combination with a structure of the type last described, a manually operable, normally open switch for shunting the circuit across the warp stop motion upon said switch being closed, thus providing means for manually stopping the loom only after said given loose pick has been inserted subsequent to the closing of the switch in the corresponding terry cycle.

Some of the objects of the invention having been stated,

other objects will appear as the description proceeds, when taken in connection with the accompanying drawings, in which FIGURE 1 is a warpwise or longitudinal vertical sectional view through a terry loom of the character disclosed in my said copending application with some of the parts being shown schematically and parts broken away, and showing my improved knock-off in association therewith;

. FIGURE 2 is an enlarged detailed perspective view with parts broken away, showing parts of the main drive of the loom and parts of the knock-off mechanism looking at the opposite side of that portion of the loom shown in the right-hand portion of FIGURE 1;

FIGURE 3 is a schematic diagram of my improved stop motion control, with parts of the loom knock-off mechanism being shown at the side of the loom opposite from that side shown in FIGURE 2;

FIGURE 4 (Sheet 2) is an enlarged fragmentary detail view taken substantially along line 44 in FIG- URE 3.

Referring more specifically to the drawings, the loom shown therein is generally of the type disclosed in my said copending application wherein the beat-up point of the reed remains constant throughout both plain and terry weaving and the fell of the cloth is shifted forwardly and rearwardly during the formation of so-called loose and fast picks. However, it is to be distinctly understood that the principles of the present invention are also applicable to other types of terry looms in which the strokes of the reed are varied during each terry cycle. Since the loom is disclosed in detail in my said copending application, only so much of the same will be described as is necessary to a clear understanding of the present invention.

In FIGURE 1, the loom comprises a frame whose upper rear portion supports a terry warp beam 11 and whose lower rear portion supports a ground warp beam 12 Terry warps T and ground warps W are unwound from the respective beams Ill, 12 and pass in engagement with respective sets of rolls 13, 14, 15 and 16, 17 in their courses from beams 1-1, 12 to the weaving instrumentalities.

The weaving instrumentalities comprise an oscillating reed 20 which is driven to oscillate in a fixed range by suitable connections, not shown, in a housing 21, with a main drive shaft 22. The reed 20 is carried by oscillating arms 23, which arms also carry a row of closely spaced transversely extending shuttle guides 24 through which a gripper-type shuttle passes prior to each forward or beat-up stroke of the reed 24 The gripper-type shuttle is not shown herein, but may be of a type described in said copending application with reference to US. Patent No. 2,090,703.

In their courses from the rolls 15, 17 to the reed 20, the terry warps T 'and ground warps W pass through an electric stop motion broadly designated at 25, and they also pass through heddles or harnesses 26 which are manipulated by a pattern mechanism shown in the form of a dobby broadly designated at 30'. It is well known that the harnesses 26 form sheds of the warps T, W and the shuttles which pass through shuttle guides 24 cooperate with the reed 20 in forming cloth C, the fell of the cloth being designated at F. The cloth passes forwardly and in successive engagement with rolls 31-35 in its course to a suitably driven cloth roll 36.

Rolls 17, 32 are shiftable forwardly and rearwardly by suitable connections with a driven terry cam 40. To this end, opposed ends of rolls 17, 32, which may be termed as fell shifter rolls, are journaled in respective pairs of fell shifter levers 4-1, 42 only one pair of which is shown in FIGURE 1, the latter being interconnected at their upper portions by a link 43'. The lower portions of the shifter levers 41, 42 are journaled on the loom frame 10, as at 44, 45, and a portion of each lever 41 below its pivot point 44 has the rear end of a link 46 pivotally connected thereto.

The front end of each link 46 (only one of which is shown) is connected to the upper end of a lever 47 pivotally mounted on a cross shaft 56 journaled in the loom frame 19. A medial portionyof one of the levers 47 has another link 51 extending forwardly therefrom and being pivotally connected to the medial portion of a follower arm 52, whose lower end is suitably pivotally connected to the frame, as at 53, and whose upper end has a follower 54 thereon which engages in an irregular groove 55 formed in one face of the terry cam 40.

During terry weaving, terry cam it is continuously driven, in a manner fully disclosed in my said copending application, and the cam groove 55 thereon is so formed as to shift fell shifter rolls 17, 32 and the fell F of cloth C rearwardly a predetermined distance following the insertion and beating up of the last losse pick of each terry cycle to thus form a fast pick with the next succeeding beat-up stroke of the reed 2t Cam 40 also causes the shifter rolls 17, 32 and the fell F of cloth C to shift forwardly a predetermined distance following the insertion and beating up of each fast pick of weft so as to space the fell of the cloth a predetermined distance ahead of the beat-up point of the read 20 during the insertion and beating up of the losse picks of weft.

Roll 13, which is intermittently driven and serves as a feed roll for the terry warps T, is driven to advance or slacken the terry warps relative to the ground warps W whenever the fell F of cloth C is shifted rearwardly so that, when reed 20 subsequently moves forwardly in forming a fast pick, the combined friction of the fast pick and the previously inserted loose picks causes the thus slackened terry warps to move forwardly relative to the ground warps, thus forming terry loops as the terry warps are bunched up against the fell F.

The warp stop motion 25 comprises a group of spaced rods 60 over which pass the terry and ground warps T, W, the rods 60 being suitably supported by the loom frame 10. A separate and independent drop: wire 61 normally rests upon each ground warp and each terry warp and is suspended between an adjacent pair of said rods 60, there being four banks of drop wires 61 shown in FIGURE 1, but only one of the drop wires being shown in FIGURE 3.

As best shown in FIGURE 3, each drop wire 61 has an opening 62 in its upper portion through which a pair of contact or electrode bars 63, 64 extends, the contact bar or electrode 64 being substantially U-shaped and having the contact bar or electrode 63 positioned therein with an insulation material 65 therebetween. Thus, upon either the parting or undue slackening of either a ground warp or a terry warp, the corresponding drop Wire 61 drops iagainst electrode 63 while in contact with mating electrode 6d to establish contact therebetween.

Each electrode 64 is grounded by a conductor as which may be connected to the loom frame. Each electrode 63 of the electric stop motion 25 is connected to a knock-oh mechanism broadly designated at 76, by means to be presently described.

Although the main drive and knock-off mechanism are not visible in FIGURE 1, the main drive is shown in FIGURE 2 and portions of the knock-off mechanism are shown in FIGURES 2 and 3. The main drive will now be described. It will be observed in FIGURE 2 that the main frame 10 includes a right-hand side frame member 1022 outwardly beyond which the main drive shaft 22 extends, said main drive shaft having a splined portion 71 thereon on which a brake drum 72 and a clutch mechanism are mounted.

The clutch mechanism includes a clutch facing carrier 74 having a hub 75 which is splined or keyed on the splined portion 71 of main drive shaft 22. The hub portions of a pair of peripherally grooved fly-wheels or V-pulleys 76, 77 are journaled on the hub 75 and straddle the facing carrier 74. Opposed sides of the outer portion of facing carrier '74 have friction clutch facings 80, 81 thereon which are adapted to be engaged by the proximal surfaces of V-pulleys 76, '77.

The grooves of the V-pulleys 76, '77 are engaged by corresponding endless V-belts 82 which may be continuously driven by any suitable means such as an electric motor, not shown. The hub 75 of facing carrier 74 and the V-pulley 77 are limited as to outward movement by a suitable disk 83 fixed on the outer end of the splined portion 71 of main drive shaft 22. The reduced outer end portion of shaft 22 may be provided with a suitable hand wheel, which is not shown, since it is not necessary to the disclosure of the present invention.

The inner portion of the hub 75 of clutch facing carrier 74 has a plurality of compression springs 85 mounted in suitable cavities therein, only one of the compression springs being shown. The compression springs 85 bear against a disk 86 keyed or splined on the splined portion 71 of main drive shaft 22, and the inner surface of disk 86 is engaged by a plurality of circularly spaced clutch pins 37 which loosely extend through the hub portion of brake drum 72.

The other or inner ends of clutch pins 87 bear against another disk 90 which may also be keyed or splined on the splined portion 71 of shaft 22 and whose inner surface is engaged by ta suitable thrust bearing 91 mounted on shaft 22. The inner surface of thrust bearing 91 is engaged by a clutch shifting block 93 which is freely mounted or journaled on the shaft 22 so that it may move axially of shaft 22 and so that shaft 22 may rotate within clutch block 93. v

The clutch block 93 is suitably slotted for receiving a pair of diametrically opposed clutch dogs 94, only one of which is shown in FIGURE 2. Each clutch dog 94 is mounted in the free end of a corresponding yoke arm 95 fixed on a forwardly and rearwardly extending shaft 96 journaled in side frame member a of frame 10.

Itis thus seen that the springs 85- normally urge disk 36, pins 87, thrust bearing 91 and clutch block 93 inwardly or from right to left in FIGURE 2, so that the pulleys 76, 77 may rotate independently of and relative to the clutch facings 80, 81, the carrier 74 and its hub 75.

The front end of shaft 96 has a clutch cnank 100 fixed thereon which is adapted to be moved downwardly at its free end by a clutch control lever 101 which engages an abutment or screw 100a in crank 100, in a manner to be later described. It is apparent that downward movement of the free end of crank 100 imparts outward or left-to-right movement to clutch block 93 so the pins 87 are moved against disk 05, and disk 86 in turn, moves V-pulley 76 against the corresponding clutch facing 80. The clutch facing carrier 74 is in the form of thin radial arms made from a flexible ma terial and extending from hub 75 so that the outer portion of carrier 74 is biased toward the outer V-pulley 77 as the V-pulley 76 is moved against facing 80. Thus, facing 81 is moved against the inner surface of pulley to drive shaft 22.

Referring to the lower left-hand portion of FIGURE 2, it will be observed that clutch control lever 101 extends rearwardly and is pivotally mounted on a pivot pin 102 whose opposed portions are pivotally connected to a pair of brake actuating plates 103. The innermost portions of plates 103 are pivotally mounted on a brakeband-supporting stub shaft 104 carried by the side frame member 10a. Thus, the clutch control lever -101 and the brake actuating plates 103 collectively form a toggle lever.

The looped end of a brake band 105 is mounted on stub shaft 104 between plates 103'. Brake band 105 extends substantially around brake drum 72 and its other 6 end is looped about a brake pull shaft 106 to which the upper end of a connecting rod 107 is connected.

Connecting rod 107 is surrounded by a compression spring 110. The lower end of connecting rod 107 is connected to a cuff 111 pivotally mounted on a brake pivot shaft 112 carried by plates 103. The lower ends of a pair of spaced trip links 113 are pivotally mounted on pivot pin 102 in the bifurcated rear portion of clutch control lever 101. The upper end of a relatively heavy tension spring 114 is connected to pivot pin 102 between the trip links 113. The lower end of spring 114 is anchored, as at 115, to side frame member 10a.

The trip links 113 extend upwardly in FIGURE 2 and are then angled forwardly and are pivotally connected, as at 116, to the upper end of a trip block 117 whose lower end is pivotally connected, as at 120, to side frame member 10a. An adjustable abutment 121, in the form of a set screw, is suitably mounted between the trip plates 113 and normally engages the rear surface of trip block 117 adjacent the pivot point 120 thereof so that pivot point 120 is positioned forwardly of dead center, with respect to the pivot pin 102 and the pivot point 116, during operation of the loom.

Trip links 113 and trip block 117 are shown in normally operative position; that is, they are shown in the position occupied thereby during normal operation of the loom. The trip links 113 and trip block 117 are maintained in said operative position by a shouldered trip pin *122 suitably secured to and projecting forwardly from the lower portion of a stop hub 123 fixed on a detector shaft 124 suitably journaled in frame 10, including side frame member 10a and a side frame member 10b, only a portion of which is shown in FIGURE 3.

In the upper left-hand portion of FIGURE 2, it will be observed that the loom frame 10 has a shipper shaft 125 journaled therein which is provided with a plurality of handles 126 projecting radially therefrom, only one of which is shown. The end of the shipper shaft 125 nearest the observer in FIGURE 2 has the upper end of a shipper link 127 pivotally connected thereto. "The lower end of shipper link 127 loosely extends through a slot formed in a medial portion of clutch control lever 101 and is pivotally mounted on a pivot pin 130 carried by clutch control lever 101.

As heretofore stated, .during operation of the loom, the Various parts occupy the position shown in FIGURE 2. Now, in order to stop the loom either manually or automatically, detector shaft 124 of FIGURE 2 is rotated in a clockwise direction sufficiently to raise the shoulder of shouldered trip pin 122 out of engagement with the upperend of trip block 117. Thereupon, tension spring 114 pulls links 113 downwardly, in the course of which trip block 117 moves in a clockwise direction in FIG- URE 2. Also, this moves downwandly the pivot pin 102 connecting the clutch control lever 101 with plates As spring 114 moves the (front ends of plates 103 downwardly, it is apparent that brake pivot shaft 112 moves downwardly relative to stub shaft 104 to tighten the brake band 105 against brake drum 72, thus braking 77 so that the rotating pulleys 76, 77 then impart rotation the main drive Shaft At the Same time that the brake is operated in the manner last described, the downward movement of pivot pin 102 permits clutch crank 100 to move upwardly under the pressure of the springs 85, it being apparent that springs move clutch block 93 from right to left or inwardly in FIGURE 2 and thus rotate shaft 96 in such a direction as to cause the free end of clutch crank to move upwardly. Thus, the clutch is disengaged and the brake is applied substantially simultaneously. Actually, the disengagement of the clutch occurs immediately prior to the brake band in a counterclockwise direction. In so doing, thefree front end of clutch control lever 1111 is moved upwardly against a fixed abutment 131 carried by the loom side frame member 1% and, since the abutment 131 limits the extent of upward movement of the free front end of clutch control lever 1111, further counterclockwise movement of shipper shaft 125 causes pivot pin 102 to move upwardly against the pull of spring 114.

In so doing, the upper ends of trip links 113 are moved upwardly and forwardly about the pivot point 121 with trip block 117 and, thus, trip block 117 is returned into engagement with the shoulder of shouldered trip pin 122. It is apparent that this releases the brake, because cuff 111 and connecting rod 107 move upwandly and release the tension in brake band 105.

After the brake has been released in (the manner heretofore described, shipper shaft 125 is rotated in a clockwise direction (to return the handles, such as handle 126, to the position shown in FIGURE 2. In so doing, since pivot pin .102 is restrained from downwand movement by engagement of the trip block 117 with the shoulder of shouldered trip pin 1112, pivot pin 102 cannot move downwardly and, therefore, the free end of clutch control lever 101 is moved downwardly against the screw 150a carried by clutch crank and thus imparts downward movement to the free end of clutch crank 100. As heretofore stated, the clutch block 93 is then moved from left to right or outwardly in FIGURE 2 to thus engage the clutch including the V-pulleys 76, 77 and clutch friction plates S11, 81. Thereupon, pulleys 76, 77 transmit rotation to main drive shaft 22.

Now, in order to automatically operate the detector shaft 124, it will be observed in FIGURE 3 that the end of detector shaft 124 opposite from stop hub 123 has a detector block 133 adjustably secured thereon which is normally urged in a clockwise direction in FIGURE 3 by a tension spring 134, and which thus normally urges downwardly the shouldered trip pin 122 and also normally urges rearwardly a link 135. The left-hand end of spring 134 (FIGURE 3) is connected to loom frame 10 and the other end of spring 134 is connected to the lower portion of block 133. The front end of link 135 is pivotally connected to the lower portion of detector block 133 and the rear portion of detector link 135 is pivotally connected to a crank 136 suspended from a shaft 137 journaled in side frame member 10b.

A medial portion of detector link 135 has an adjustable abutment 140 fixed thereon which is urged against one arm of a bell crank 141 by the tension spring 134. Bell crank 141 is pivotally mounted, at the juncture of its two arms, on the loom side frame 10b, and the other arm thereof has the upper end of a latch 142 pivotally con nected thereto.

The front end of a solenoid plunger 143 is slidably and pivotally connected to a medial portion of latch 142, and its rear portion extends through a guide 144 and through one wall of a box 145 within which a solenoid coil 146 is suitably mounted. A compression spring 147 engages the inner or rear surface of guide 144 and also engages a collar fixed on the solenoid plunger 143, thus normally urging solenoid plunger 143 from right to left in FIGURE 3 and normally maintaining the shouldered lower portion of latch 142 out of engagement with the vertically oscillating free end of a knock-off lever 151. A spring 148 surrounds the right-hand portion of plunger 143 and permits plunger 143 to move forwardly to a greater extent than latch 142 when latch 142 engages knock-off lever 151.

The front end of knock-01f lever 151 is pivotally connected to side frame member 113b, as at 152 and, by referring to FIGURE 4 (Sheet 2), it will be observed that the rear free end portion of knock-off lever 151 is eccentrically connected to the corresponding end of main drive shaft 22. To this end, main drive shaft 22 has an eccentric 153 adjustably secured thereon, as by a set screw 154. The eccentric 153 has an offset or eccentrically mounted pin 154 projecting outwardly therefrom, which pin is journaled in a slid block 155 guided for longitudinal movement in a groove 156 formed in the inner surface of the free end portion of knock-off lever 151. Since main drive shaft 22 rotates continuously during operation of the loom, it is apparent that the eccentric 153 imparts vertical reciprocation to the free or rear end portion of knock-off lever 151 throughout operation of the loom.

When the solenoid coil 1% of FIGURE 3 is energized, solenoid plunger 143 moves from left to right in FIG- URE 3, thus moving the latch 142 against the knock-off lever 151. When the knock-off lever 151 subsequently moves upwardly, it engages the shoulder on latch 142, thus imparting clockwise movement to hell crank 141, moving detector link 135 forwardly or from left to right in FIGURE 3 and imparting counterclockwise movement to detector shaft 12d and hub 123 in FIGURE 3 and clockwise movement to detector shaft 124- and hub 123 in FIGURE 2. As heretofore stated, this disengages the clutch and actuates the brake so as to stop the loom. It is thus apparent that the instant the loom is to be stopped is determined by the position of the eccentric 153 relative to drive shaft 22 following energization of solenoid coil 146.

Referring to FIGURE 3, it will be observed that one end of solenoid coil 146 is connected, by means of a conductor 160, to one end of a secondary coil 161 of a suitable transformer 162. The other end of secondary coil 161 is grounded to the frame 1th by a conductor 163. The primary coil 165 of transformer 162 has a pair of conductors 166 167 connected to opposite ends thereof and leading to a suitable source of current embodied in a male plug 170.

The end of coil 146 opposite from conductor 16!) has a conductor 171 leading therefrom which may be directly connected to the electrodes 63 of the warp stop motion 25. However, since the main shaft 22 and the eccentric 153 thereon rotate a single revolution with each pick of the loom, and it is preferable that loom stoppage may be effected only after the second or last loose pick of weft has been inserted through the shed in each terry cycle of a terry loom, conductor 171 is a part of a secondary circuit which can be completed only during a predetermined pick of the loom following the completion of a primary circuit embodied in the electric stop motion 25, this being one of the important features of the present invention.

To this end, it will be observed in the upper right-hand portion of FIGURE 3 that conductor 171 is connected to one side of a normally closed switch 172, which switch is also shown in the upper central portion of FIGURE 1. The other side of switch 172 has a conductor 173 leading therefrom to each of the electrodes 63 of the electric stop motion 25. A signal lamp 175 is preferably interposed in conductor 173.

Normally spaced below switch 172 is a switch actuating arm 176 pivoted at one end on the loom frame 10, as at 177. The end of switch actuating arm 176 opposite pivot 177 has a link 1811 extending upwardly therefrom to one of the jacks 131 of dobby 3d. Dobby 35 is shown somewhat schematically in the right-hand upper portion of FIGURE 3, and is shown in the form of a Staubli dobby such as is disclosed in US. Patent No. 2,465,689.

In this instance, the jack 181 is connected to the medial portion of a rocker 182 having tie hooks 183, 184 connected to upper and lower portions thereof and extending outwardly therefrom. Spaced below the tie hook 134 is a pattern strip 185 which is mounted on a suitably driven roller 186 driven in timed relation to the operation of the loom. The pattern strip or chain 135 has spaced pegs 187 thereon which engage and raise the outer portions of weighted levers 190 which are pivoted, as at 191, on the frame of dobby 3!). The weighted lever 1% shown in FIGURE 3 has an upwardly projecting feeler portion 193 which lowers the lower hook 184 into engagement with one of a pair of reciprocating knives 134, 195.

The upper reciprocating knife 195 is adapted to be engaged by the corresponding upper hook 183. As is well .known, and as is fully disclosed in said US. Patent No. 2,465,689, whenever the hook is not engaged and raised by the feeler portion 193 on weighted lever 190, due to one of the pegs 187 moving into engagement with and rocking the weighted lever 190 in a counterclockwise direction in FIGURE 3, the next succeeding movement of the knife 194 from left to right causes rocker 182 to move from left to right therewith and thereby move jack 181 in a clockwise direction.

This raises link 180 and switch actuating arm 176 upwardly to move switch 172 to open position. In weaving a three-pick terry, for example, switch 172 is moved to the open position, in the manner heretofore described, during the fast pick and the first loose pick of each terry weaving cycle so that, even though the conductor 173 may be grounded through the warp stop motion or by other means to be later described, current cannot flow through the solenoid coil 146 in the lower left-hand portion of FIGURE 3.

On the other hand, during the insertion of the second or last loose pick of weft through the shed in each terry cycle, the weighted lever 190 may bear against the pattern strip 185 without being engaged by one of the pegs 187, with the result that the corresponding hook 184 is raised out of the path of knife 194 and the switch actuating arm is caused to occupy the position shown in FIGURES 1 and 3.

It follows that switch 172 occupies closed position during the second loose pick of each terry cycle. Thus, upon conductor 173 being grounded, due to the parting or undue slackness of any one of the ground or terry warps permitting the corresponding drop wire 61 to establish contact between the corresponding pair of electrodes 63, 64, the subsequent closing of the switch 172 establishes contact between the primary and secondary circuits and energizesthe solenoid coil 146.

As heretofore stated, upon energization of solenoid coil 146, latch 142 is moved forwardly into engagement with the free end of knock-off lever 151 so that, with subsequent movement of knock-off lever 151, the detector shaft 124 is rotated in a counterclockwise direction in FIGURE 3 or in a clockwise direction in FIGURE 2 to thus move the shouldered trip pin 122 out of engagement with trip block 117, thus releasing the clutch and actuating the brake.

Although pattern controlled switch 172 causes the knock-oflF mechanism to operate during the second loose pick with each terry cycle of the loom in which conductor 173 may be grounded through the medium of the warp stop motion 25, it is highly desirable that the stoppage of the loom is effected immediately after insertion of the second or final loose pick of the corresponding terry cycle so that the reed is still in its rearmost position and all the harnesses are still supported on the dwell of the conventional cams 196, 197 of dobby 30, it being noted that knives 194, 195 are carried by pivoted levers D, E equipped with followers F engaging cams 196, 197. In the latter instance, one of the knives 194 or 195 is fully to the left and the other of the knives is fully disposed to the right as shown in FIGURE 3 and as is also shown in said Patent No. 2,465,689.

Accordingly, eccentric 153 is adjustably mounted on the end of shaft 22 (FIGURE 4) so that the rear end of knock-off lever 151 (FIGURE 3) moves upwardly sufficiently to stop the loom at the desired instant, when allowing approximately of angular movement or rotation of main shaft 22 after shouldered trip pin 122 has been rocked out of engagement with the trip block 117 for the braking action to become effective to stop the loom at the desired position.

It is very important that the loom is always caused to stop with the harnesses and reed in the same position and immediately following the insertion of the last loose pick of the corresponding terry cycle, for the above noted reasons, regardless of whether the loom is stopped by a drop wire 61 engaging a corresponding electrode 63 or by manually operable means. Therefore, in order to effect manual stoppage of the loom at the same instant at which the loom would be stopped if a drop wire engaged any one of the electrodes 63, I have provided a manually operable, normally open switch 200, to one side of which a conductor 201 is connected and to the other side of which a conductor 202 is connected. Con ductor 201 leads to conductor 173 and conductor 202 leads to the ground or frame 10. Switch 200 may be of the push-button type and may be located on the loom frame 10 or at any other convenient location for stopping the loom.

It is apparent that closing of switch 200 bypasses the electric stop motion 25 and only causes operation of the knock-off mechanism 70 upon switch 172 being permitted to close by the pattern mechanism or dobby 30 in exactly the same manner as that effected by engagement of a drop wire 61 with an electrode 63. Accordingly, it is apparent that the closing of switch 200 causes the loom to stop immediately after the second or last loose pick of a terry cycle has been inserted in the shed of the warps and before said last loose pick is beat up by the reed.

Additional means is provided which operates in conjunction with electric stop motion 25 for stopping the loom in the same manner in which the loom is stopped by the closing of switch 2% or by the dropping of a drop wire 61 against the corresponding electrode 63. Said additional means comprises a hand lever 205, one of which is preferably positioned adjacent each side frame member of the loom. The free end of hand lever 205 is conveniently positioned in spaced relation above the front shifter roll 32, and its rear end is connected to a metallic arm 206.

The rear end of arm 2% is pivotally connected to the loom frame 10, as at 207. A spring 210 is connected to the forward portion of arm 206 and extends upwardly therefrom and has its other end connected to a fixed part of the loom frame 10, as at 211. The arm 206 is grounded to the loom frame, as at 212, and a metallic contact block 213 is adjustably secured to the arm 206, as by a screw 214, so that it may be adjusted longitudinally of the arm 266 to position the free end thereof above any one of the electrodes 63, as desired.

The spring 210 normally holds the contact block 213 in spaced relation above the corresponding electrode 63. However, it is apparent that, upon an operator imparting downward movement to handle 2615 and arm 206, contact block 213 engages the corresponding electrode 63 to thus ground and close the circuit thereto so that the loom will stop thereafter as the next succeeding last loose pick of the corresponding terry cycle of the loom is inserted. It is thus seen that the handle 205, arm 206 and contact block 213 may function in the same manner as the manually operable switch 200 or as the dropping of a drop wire 61 against :a corresponding electrode 63 in effecting stoppage of the loom immediately following the insertion of the second or last loose pick of a terry cycle through the shed.

It is thus seen that I have provided a m having a common electric stop motion for all the terry and ground warps with pattern controlled means interposed between the electric stop motion and la knock-off mechanism for causing the knock-off mechanism to function only after a second or last loose pick of a corresponding terry cycle has been inserted and wherein the loom is caused to stop with the harnesses, reed [and other operating parts thereof in a predetermined position. It is seen further that I have provided manually controlled means for partially completing the circuit to the knock-off mechanism and wherein the pattern controlled means fu-nctionsin such a manner to insure that the loom stops immediately following the insertion of the second ioose pick of a three-pick terry cycle or, at least, immediately following the insertion of the last loose pick of any corresponding terry cycle.

In the drawings and specification there has been set forth a preferred embodiment of the invention and, although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being defined in the claims.

I claim:

1. In a loom for weaving terry cloth having weaving instrument-alities [for forming successive terry cycles each including means for inserting and beating up at least two loose picks in ground and terry warps at a point spaced rearwardly of the fell of the cloth and for inserting a fast pick after said loose picks and for beating up the fast and loose picks against the fell of the cloth to form terry loops slackened terry warps, said loom including, a knock off mechanism and a stop motion operable upon parting or undue slackening of said ground and terry warps to actuate said knock-oil mechanism to stop operation of said loom; in combination therewith, means associated with said stop motion for rendering the same operable only after the insertion of the last loose pick and immediately prior to the insertion of the fast pick in any terry cycle.

2. In a loom for weaving terry cloth having weaving instrumentalities for producing successive terry cycles each including means for inserting and beating up at least two loose picks in ground and terry warps at a point spaced rearwardly of the fell of the cloth and for inserting a fast pick after said loose picks and for beating up the fast and loose picks against the fell of the cloth to form. terry loops from slackened terry warps, said loom including a knock-off mechanism, and a stop motion operable upon parting or undue slackening of said ground and terry warps to actuate said knock-oil mechanism to stop operation of said 100m; in combination therewith, manually operable means positioned in parallel to said stop motion for manually actuating said knock-off mechanism as desired, and means associated with said stop motion and said manually operable means for rendering the same operable only after the insertion of the last loose pick and immediately prior to beating up the last loose pick and, also, prior to the insertion of the fast pick in any terry cycle.

3. In a terry loom having means for weaving terry cloth from ground warps and terry warps and including beating means, means to insert picks of weft in the shed of said warps, means for varying the relative positions of the fell of the cloth and the beat-up point of the beating means to form at least two loose picks and a fast pick in each terry loop forming cycle, an electrical stop motion for said warps, said stop motion comprising at least one pair of cooperating electrode bars insulated each from the other and a series of drop wires normally supported by the warps land being operable to establish contact between said electrode bars upon the parting of a corresponding warp, said loom also having an electrically operable knockoif mechanism operable in response to establishing contact between said electrode bars for stopping the loom, and a pattern mechanism; the combination therewith of a normally open switch interposed in an electrical circuit between the electrode bars and the knock-off mechanism, and means under control of said pattern mechanism for closing said switch to close the circuit between the electrode bars and the knock-oflf mechanism during formation of the last of said loose picks of each terry cycle of the loom, whereby the knock-off mechanism is operated at the same pick during each terry cycle in which the circuit is completed across the electrode bars by a drop wire.

4. In a terry loom having means for weaving terry cloth from ground warps land terry warps and including beating means, means to insert picks of weft in the shed of said warps, means for varying the relative positions of the fell of the cloth and the beat-up point of the heating means to form at least two loose picks and a fast pick in each terry loop forming cycle, an electrical stop motion for said warps, said stop motion comprising at least one pair of cooperating'electrode bars insulated each from the other and a series of drop wires normally supported by the warps and being operable to establish contact between said electrode bars upon the parting of a corresponding warp, said loom also having an electrically operable knock-off mechanism operable in response to establishing contact between said electrode bars for stopping the loom, and a pattern mechanism; the combination therewith of a normally open switch interposed in an electrical circuit between the electrode bars and the knockoif mechanism, means under control of said pattern mechanism for closing said switch to close the circuit between the electrode bars and the knoc -off mechanism and to excite said knock-01f mechanism during formation of the last of said loose picks of each terry cycle of the loom whereby the knock-off mechanism is operated at the same pick during each terry cycle in which the circuit s completed across the electrode bars, and manually operable means for shunting the circuit across said electrical stop motion.

5. A structure according to claim 4 in which said circuit includes conductor means between one side of the electrically operable knock-off mechanism and one of said electrode bars, said switch being interposed in said lastnamed conductor means, and said manually operable shunting means comprising a normally open switch operable to close the circuit between said one of the electrode bars and the other side of the electrically operable knockoff mechanism.

6. A structure according to claim 5 in which said loom includes a main shaft, and means responsive to excitation of said knock-off mechanism for stopping the loom with said shaft in a predetermined angular position such that the loom stops immediately following insertion of said last loose pick.

7. In a terry loom having means for weaving terry cloth from ground warps and terry warps, an electrical stop motion for said warps, said stop motion comprising at least one pair of cooperating electrode bars insulated each from the other and a series of drop wires normally supported by the warps and being operable to establish contact between said electrode bars upon the parting of a corresponding warp, said loom also having an electrically operable knock-oil mechanism operable in response to establishing contact between said electrode bars for stopping the lcorn, and a pattern mechanism; the combination therewith of a switch interposed in an electrical circuit between the electrode bars and the knock-off mechanism, means under control of said pattern mechanism for operating said switch to close the circuit between the electrode bars and the knock-oil mechanism at a predetermined instant during each terry cycle of the loom, and manually operable means for shunting the circuit across said electrical stop motion whereby the knock-off mechanism is operated at the same instant during each terry cycle in which the circuit is completed across the electrode bars either by said shunting means or by a drop wire.

8. A structure according to claim 7 in which said circuit includes conductor means between one side of the electrically operable knock-off mechanism and one of said electrode bars, said switch being interposed in said lastnamed conductor means, and said manually operable shunting means comprising a normally open switch for closing the circuit between said one of the electrode bars and the other side of the electrically operable knock-off mechanism.

9. A structure according to claim 7 in which said circuit between the electrode bars and the electrically operable knock-off mechanism includes first conductor means extending from one of said electrode bars to one side of the electrically operable knock-off mechanism, said switch being interposed in said first conductor means, said shunting means comprising means connecting the other side of said knock-off mechanism to one side of a source of elec- 13 trical energy, a hand lever pivotally mounted on the loom at a point adjacent said stop motion, a handle extending forwardly from said hand lever and adapted to be moved downwardly by an operator, means yieldably retaining said hand lever in raised position, a contact block carried by said hand lever and normally spaced above said one of the electrode bars, means electrically interconnecting said hand lever and the other side of the source of electrical energy, whereby said handle, hand lever and contact block may be manually moved downwardly to move the contact block into engagement with said one of the electrode bars and the circuit to said knock-01f mechanism will 14 be closed upon subsequent operation of said switch by said pattern mechanism, and means operable at a predetermined interval following the closing of the circuit to said knock-01f mechanism for actuating the knock-off mechanism and stopping the loom.

References Cited in the file of this patent UNITED STATES PATENTS 1,786,675 Regan Dec. 30, 1930 2,355,129 Whittaker et a1 Aug. 8, 1944 2,638,940 Case May 19, 1953 

1. IN A LOOM FOR WEAVING TERRY CLOTH HAVING WEAVING INSTRUMENTALITIES FOR FORMING SUCCESSIVE TERRY CYCLES EACH INCLUDING MEANS FOR INSERTING AND BEATING UP AT LEAST TWO LOOSE PICKS IN GROUND AND TERRY WARPS AT A POINT SPACED REARWARDLY OF THE FELL OF THE CLOTH AND FOR INSERTING A FAST PICK AFTER SAID LOOSE PICKS AND FOR BEATING UP THE FAST AND LOOSE PICKS AGAINST THE FELL OF THE CLOTH TO FORM TERRY LOOPS FROM SLACKENED TERRY WARPS, SAID LOOM INCLUDING A KNOCKOFF MECHANISM AND A STOP MOTION OPERABLE UPON PARTING OR UNDUE SLACKENING OF SAID GROUND AND TERRY WARPS TO ACTUATE SAID KNOCK-OFF MECHANISM TO STOP OPERATION OF SAID LOOM; IN COMBINATION THEREWITH, MEANS ASSOCIATED WITH SAID STOP MOTION FOR RENDERING THE SAME OPERABLE ONLY AFTER THE INSERTION OF THE LAST LOOP PICK AND IMMEDIATELY PRIOR TO THE INSERTION OF THE FAST PICK IN ANY TERRY CYCLE. 